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Nikola Mladenovic

@nikolamladenovic

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Experienced system and web administrator focused on secure, reliable Linux infrastructure.

Serbia

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What I'm looking for

I am seeking a role focused on Linux system and web infrastructure, security-first operations, automation, and monitoring within a collaborative, growth-oriented team.

I am a system and web administrator with extensive hands-on experience managing and securing Linux-based infrastructures for production websites and services. I have maintained over 40 Linux servers, managed LAMP/LNMP stacks, and handled migrations and upgrades for Drupal and WordPress instances.

My work emphasizes security, backups, monitoring and automation: I set up Postfix mail servers, configured OpenVPN and WireGuard, implemented monitoring with Nagios/Zabbix and participated in projects using Ansible, Grafana, Prometheus and Borg. I routinely deploy and manage code via Git/Bitbucket and work with puppet-managed systems such as Aegir.

I bring practical troubleshooting skills, Office365 and Azure administration at the company level, and experience supporting colleagues and clients. I seek roles where I can apply strong system administration, automation and security practices to maintain reliable production environments.

Experience

Work history, roles, and key accomplishments

Current

System and Web Administrator

Current

Catalyst Balkans

Jun 2017 - Present (8 years 7 months)

Maintain and secure a fleet of 40+ Linux servers and websites, led migrations from Drupal 7 to Drupal 10 and implemented backup and monitoring solutions to ensure availability and integrity.

Linux Drupal WordPress Postfix Puppet Aegir Backup

Junior Systems Engineer

Providus Managed Cloud

Dec 2015 - Feb 2017 (1 year 2 months)

Managed Debian/Linux, FreeBSD and Windows servers, handled monitoring, DNS, load balancing and DDoS mitigation, and supported LAMP/LNMP stacks and Virtualmin/WordPress deployments.